/*
 * aes_icm.h
 *
 * Header for AES Integer Counter Mode.
 *
 * David A. McGrew
 * Cisco Systems, Inc.
 *
 */

#ifndef AES_ICM_H
#define AES_ICM_H

#include "aes.h"
#include "cipher.h"

typedef struct {
    v128_t counter; /* holds the counter value          */
    v128_t offset; /* initial offset value             */
    v128_t keystream_buffer; /* buffers bytes of keystream       */
    aes_expanded_key_t expanded_key; /* the cipher key                   */
    int bytes_in_buffer; /* number of unused bytes in buffer */
} aes_icm_ctx_t;

err_status_t aes_icm_context_init(aes_icm_ctx_t *c, const unsigned char *key);

err_status_t aes_icm_set_iv(aes_icm_ctx_t *c, void *iv);

err_status_t aes_icm_encrypt(aes_icm_ctx_t *c, unsigned char *buf,
        unsigned int *bytes_to_encr);

err_status_t aes_icm_output(aes_icm_ctx_t *c, unsigned char *buf,
        int bytes_to_output);

err_status_t aes_icm_dealloc(cipher_t *c);

err_status_t aes_icm_encrypt_ismacryp(aes_icm_ctx_t *c, unsigned char *buf,
        unsigned int *enc_len, int forIsmacryp);

err_status_t aes_icm_alloc_ismacryp(cipher_t **c, int key_len, int forIsmacryp);

#endif /* AES_ICM_H */

